【摘要】 上覆岩体渗透特性演化规律的研究对瓦斯卸压抽采具有重要应用价值,以天地王坡矿为研究背景,通过实验室相似模拟实验,获得测点气体流量数据,建立了覆岩应力与渗透率之间定量关系,利用FLAC3D软件内置fish语言采用顺序耦合方式模拟和分析采动覆岩渗透率演化规律,得出上覆岩体在不同开采阶段,由于承载结构的不同,覆岩所具有的渗透特性不同。通过数值试验得到采动覆岩的力学承载结构由梁结构-拱上梁结构组成,岩梁结构控制的渗透特性规律整体表现为漏斗状,由下至上,由外侧至内侧,渗透特性的减弱程度逐渐淡化;拱上梁结构随工作面推进呈整体向上发展到趋于稳定再周期性向推进方向前移的特性。更多还原

【Abstract】 The rule of permeability development of overlying strata influenced by mining has important application value for methane drainage. Taking Wangpo Colliery as background,the relationship of stress and permeability of overlying strata was set up by gas flow data from analogue simulation. Applying Fish language of FLAC3Dto simulating mining and analyzing permeability development rule,it was obtained that permeability was different in overlying strata because different bearing structures in different mining phrases. Mechanical bearing structure of overlying strata influenced by mining was made of beam and beam-over-arch on the basis of numerical simulation result. Permeability rule controlled by rock beam structure took on funnel-form,from top to bottom,from outside to inside,permeability weakening degree gradually decreased,with mining face advancing,beam-over-arch structure developed upward till it became stable.更多还原